Mounting means for the warp stop motion device in weaving looms



Nov. 4, 1958 J. PICANOL 2,358,857

MOUNTING MEANS FOR THE WARP STOP MOTION DEVICE IN WEAVING LOOMS 5Sheets-Sheet 1 Fiied Nov. 1, 1956 7 d Fig} J.PLCCLHOZ) INVE/WDF' Nov. 4,1958 J. PICANOL 2,853,357

MOUNTING MEANS FOR THE WARP STOP MOTION DEVICE IN WEAVING LOOMS FiledNov. 1, 1956 3 Sheets-Sheet 2 J.PLcc1.noI wry/r01? PERO'IJVLLIL ATTORNEYI Nov. 4, 1958 J. PICANOL MOUNTING MEANS FOR THE WARP STOP MOTION DEVICEIN WEAVING LOOMS Filed Nov. 1, 19.56

5 Sheets-Sheet '3 J. PLccLnol M/VENTUR skm g g r Arron/EV! United tatesPatent MOUNTING. MEANS FOR. THE WARP STOP MOTION DEVICE IN WEAVINGLOOMSJaime Picanol, Zillebeke-lez-Ypres, Belgium Application November 1,1956, Serial No. 619,785

Claims priority, application Belgium December 17, 1955 1 Claim. (Cl.139-369) As it is well known, in weaving, the exactpositioning of thetoothed racks and 'the 'warp stop motion device is of greatirnportance.Indeed, if for instance the toothed racks are too high there will beexcessive frictiont between thethreads andthe-warp stopfmotion, andinasmuch the loom, when stopped, is not arrested with sufficientpromptitude, the tag or lamella will have difficulty in dropping,whereby a fault will be produced in the fabric whenever the loom stops.If, on the other hand, the racks are positioned too low, the threadswill rub against the bottom side of said racks, which is equallyharmful. It follows then, that the grain or, with other words, theappearance of the fabric depends very much on the correct positioning ofthe toothed racks and the warp stop motion. It is therefore of greatimportance to provide means for rapidly and accurately shifting oradjusting the warp stop motion device, whereby the latter may readily belifted or lowered, preferably even during the operation of the loom.

The object of the invention is to provide such means. For this purposethe warp stop motion is mounted on two pivoting arms disposed at eitherside of the loom, so that in order to lift or to lower said warp stopmotion it sufiices to unscrew both said arms and to swing them upward ordownward so as to almost instantaneously effectuate the requiredpositional adjustment of said warp stop motion device. Said operationsmay readily be executed, while the loom is running. This in fact is veryimportant, as it enables to observe whether the crossing of the threadsis taking place correctly and thus to choose the right position underactual operating conditions, whereby the adjustment is greatlyfacilitated. Moreover, by judiciously choosing a suitable location forthe pivoting center of said supporting arms, e. g. near the lower limitof the travel of the heddle frames whereby the sheet of warp threads isguided, it may be obtained, that by lifting or lowering the warp stopmotion device the latter will readily be placed and maintained inparallel relationship with the sheet of threads. As a result the warpstop motion device may be made to faithfully follow, in a way, themovements of the sheet of threads, which is of great importance for theconduct of the weaving operation. In fact, the arrangement of theinvention enables to maintain a constant relative position between thewarp stop motion device and the sheet of warp threads, this constantrelative position being ensured all through the weaving operation,whichever position is taken up by the sheet of threads, with other wordsby the back rest,

and said constant relative position may be set and adjusted even whilethe loom is continuing its normal operation. This arrangement accordingto the invention may be realized in different constructional forms, asvarious forms and relative positions may be resort-ed to as regards thesupporting arms of the warp stop motion device as well as the meansprovided for duly adjusting the position of said arms, while the loom isat rest or in operation.

The various characteristic features of the invention will be brought outmore clearly in the following description of an embodiment, which willbe given with reference to the appended drawings, wherein:

Figure 1 is a side elevational view of the essential elements of a loom,letting appear the location of the improved mounting of the warp stopmotion device, which is the subject of the invention;

Figures 2 and 3 diagrammatically and very succinctly show the essentialelements of the improved mounting of the warp stop motion according tothe invention;

Figure 4 is a diagrammatic view intended to illustrate the favorableresults obtained by means of the improved arrangement according tothe-invention;

Figure 5 represents a front view of a practical embodiment of theimproved arrangement according to the invention.

Referring now to the schematic representation of Figures 2 and 3, thewarp stop: motion device given, in outline, by 1 is mounted on the endsof two arms 2 disposed at either side of said warp stop motion, each ofsaid arms being mounted on a pivot such as 3 fixed on the loom frame.Said arms 2 may be swung, adjusted and secured in any wanted angularposition, e. g. with the aid of a set screw 4 resting on a stud mountedon a fixed part of said loom, said stud being engaged in an arcuateelongated slot 6 contrived in a widened portion of said arms 2. Byscrewing down or up said screw 4, said arms 2 may be swung upwards ordownwards about their respective pivots 3, lifting or lowering the warpstop motion 1, as they are so swung. The pivots 3 are located e. g.relatively to the lower limit of the motion of the heddle frames wherebythe sheet of threads (not shown) is guided, so as to cause the warp stopmotion device, while being lifted or lowered on said arms, to maintainat least approximately a parallel relation with respect to the sheet ofthreads, as the slope of the latter is changed due to the rising andfalling movements performed by the back rest during the weaving.

For this purpose said pivots 3 are preferably disposed at a leveladjacent the lower limit of the heddle frame movement. Preferably also,the warp stop motion device is so mounted as to permit adjustment of itsangular relationship with respect to the arms 2. For this purpose it maybe mounted, e. g. so as to swing on pivots 7 engaged in an elongatedslot 8 formed in said arms, its angular position being determined, onthe one hand, by a pin 9 passing through said elongated slot 8 and atthe same time through a curved oblong opening 10 in the warp stop motiondevice and, on the other hand, by a set screw 11 passing through athreaded hole of an ear 12 integral with said warp stop motion device,said set screw having its end resting on the arm 2. By screwing in orout said screws 11 the warp stop motion device may be made to swingupwards or downwards respectively on the pivots 7. At the same time thewarp stop motion device may be made to slide a short distance on saidarms 2, in a manner related with said swinging motion. By the jointaction of said different means the position of the warp stop motiondevice may thus be adjusted with great accuracy in accordance with theposition of the sheet of warp threads.

In Figure 4, the relative position of the warp stop motion device andthe sheet of threads have been shown somewhat diagrammatically.

In Figure 5, the essential elements have been shown of a practicalembodiment, comprising the warp stop motion device 1 which may be of anytype, supporting arms such as 2, the pivots such as 3, on which saidarms may swing, set screws such as 4 and the fixedly mounted studs 5each engaged in an arcuate slot 6.

Patented Nov. 4, 1.958

In this practical -'embodiment the warp 'stop motion device 1 is mountedat either side on a pivot 7 engaged in an elongated slot formed in saidarm 2. Said warp 1 stop motion device is also supported on each of saidarms 2, on the one hand bypa pin engaged insaid elongated slot 8 as wellas in the curved oblong opening 10, and on the other hand with the aidof a'screw 11 going through a threaded hole in a projecting part 12 ofsaid warp motion device.

The embodiment described is exceedingly simple and ,permits a veryaccurate, highly stable adjustment of the position of the Warp stopmotion device with a view to maintaining the latter at leastapproximately in a parallel relationship with respect to the sheet ofwarp threads.

The means for swinging, adjusting and securing the arms 2 with the warpstop motion device 1 may obviously be subject to multiple variations andmodifications, as

well as the shape and'dimensions of said arms and the accessory partspertaining thereto.

What I claim is: In weaving looms having a warp stop motion device,

supporting arms mounting said warp stop motion device, v

said arms being pivotally mounted, at one of their ends, on pivots fixedon said loom, said arms each having a longitudinally elongated slotformed at the other of its ends and having a transversely elongatedarcuate slot in- 5 termediate between said pivot and said longitudinalslot,

a pin simultaneously engaged in said longitudinal slot and in a curvedoblong opening in said warp stop motion device, a pair of studs fixedlymounted on said loom and each engaged in said transverse slot of oneof'said 10 arms, a set screw for each of said arms, extendingtransversely through part of said arm and into said transverse slot andhaving its free end resting on said st-ud in said slot.

FOREIGN PATENTS 266,285 Germany Oct. 22, 1913

